{"id":"CVE-2026-98013","state":"PUBLISHED","title":"net/sched: fq_pie: clamp quantum in change path","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: fq_pie: clamp quantum in change path\n\nfq_pie_change() accepts any quantum value from userspace, including 1.\nWith a crafted size table qdisc_pkt_len reaches ~2 GiB, so quantum=1\nmakes the deficit-refill loop spin ~2^31 times under the qdisc lock\n(a soft lockup / denial of service).\n\nAdd max(256U, ...) matching fq_codel_change().\n\nConditions to recreate the bug:\n  CONFIG_NET_SCH_FQ_PIE=y. Requires CAP_NET_ADMIN (namespace-local via\n  unshare -Urn suffices).\n\n  tc qdisc add dev dummy0 root fq_pie\n  tc qdisc change dev dummy0 root fq_pie quantum 1 stab data 32768 size_log 15 cell_log 0","publishedAt":"2026-09-25T10:23:36.527Z","updatedAt":"2026-10-19T09:12:18.653Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"ec97ecf1ebe485a17cd8395a5f35e6b80b57665a","status":"affected","lessThan":"ff4f3a0f3abd2ded467931d7da7984a68a768e0b","versionType":"git"},{"version":"ec97ecf1ebe485a17cd8395a5f35e6b80b57665a","status":"affected","lessThan":"749aaebc1eb92ce2f38fd3caf68a2f99686d84ef","versionType":"git"},{"version":"ec97ecf1ebe485a17cd8395a5f35e6b80b57665a","status":"affected","lessThan":"8fd98e56c41f79278eeb67512c28d7abc175bcf4","versionType":"git"},{"version":"ec97ecf1ebe485a17cd8395a5f35e6b80b57665a","status":"affected","lessThan":"215df1e953ae72a09d425ec188e054058ae23dc9","versionType":"git"},{"version":"ec97ecf1ebe485a17cd8395a5f35e6b80b57665a","status":"affected","lessThan":"f90fe65b977e7aa9eb302230a09eb18f8c32ceaa","versionType":"git"},{"version":"ec97ecf1ebe485a17cd8395a5f35e6b80b57665a","status":"affected","lessThan":"c11e3a39807eb5a200445ae9082843ab86800415","versionType":"git"},{"version":"ec97ecf1ebe485a17cd8395a5f35e6b80b57665a","status":"affected","lessThan":"6655b56e2801008566c594ef231f6c7b3f716c61","versionType":"git"},{"version":"ec97ecf1ebe485a17cd8395a5f35e6b80b57665a","status":"affected","lessThan":"4864f58c53eb47257d55e01f47d4a9f355f7f970","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/sched/sch_fq_pie.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.6","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.6","versionType":"semver"},{"version":"5.10.271","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.222","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.189","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.158","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.111","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.53","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.7","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/sched/sch_fq_pie.c"]}],"references":["https://git.kernel.org/stable/c/ff4f3a0f3abd2ded467931d7da7984a68a768e0b","https://git.kernel.org/stable/c/749aaebc1eb92ce2f38fd3caf68a2f99686d84ef","https://git.kernel.org/stable/c/8fd98e56c41f79278eeb67512c28d7abc175bcf4","https://git.kernel.org/stable/c/215df1e953ae72a09d425ec188e054058ae23dc9","https://git.kernel.org/stable/c/f90fe65b977e7aa9eb302230a09eb18f8c32ceaa","https://git.kernel.org/stable/c/c11e3a39807eb5a200445ae9082843ab86800415","https://git.kernel.org/stable/c/6655b56e2801008566c594ef231f6c7b3f716c61","https://git.kernel.org/stable/c/4864f58c53eb47257d55e01f47d4a9f355f7f970"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:43.249Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/98xxx/CVE-2026-98013.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-98013","state":"PUBLISHED","datePublished":"2026-09-25T10:23:36.527Z","dateUpdated":"2026-10-19T09:12:18.653Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-25T10:19:56.069Z"},"containers":{"cna":{"title":"net/sched: fq_pie: clamp quantum in change path","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: fq_pie: clamp quantum in change path\n\nfq_pie_change() accepts any quantum value from userspace, including 1.\nWith a crafted size table qdisc_pkt_len reaches ~2 GiB, so quantum=1\nmakes the deficit-refill loop spin ~2^31 times under the qdisc lock\n(a soft lockup / denial of service).\n\nAdd max(256U, ...) matching fq_codel_change().\n\nConditions to recreate the bug:\n  CONFIG_NET_SCH_FQ_PIE=y. Requires CAP_NET_ADMIN (namespace-local via\n  unshare -Urn suffices).\n\n  tc qdisc add dev dummy0 root fq_pie\n  tc qdisc change dev dummy0 root fq_pie quantum 1 stab data 32768 size_log 15 cell_log 0"}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"ec97ecf1ebe485a17cd8395a5f35e6b80b57665a","status":"affected","lessThan":"ff4f3a0f3abd2ded467931d7da7984a68a768e0b","versionType":"git"},{"version":"ec97ecf1ebe485a17cd8395a5f35e6b80b57665a","status":"affected","lessThan":"749aaebc1eb92ce2f38fd3caf68a2f99686d84ef","versionType":"git"},{"version":"ec97ecf1ebe485a17cd8395a5f35e6b80b57665a","status":"affected","lessThan":"8fd98e56c41f79278eeb67512c28d7abc175bcf4","versionType":"git"},{"version":"ec97ecf1ebe485a17cd8395a5f35e6b80b57665a","status":"affected","lessThan":"215df1e953ae72a09d425ec188e054058ae23dc9","versionType":"git"},{"version":"ec97ecf1ebe485a17cd8395a5f35e6b80b57665a","status":"affected","lessThan":"f90fe65b977e7aa9eb302230a09eb18f8c32ceaa","versionType":"git"},{"version":"ec97ecf1ebe485a17cd8395a5f35e6b80b57665a","status":"affected","lessThan":"c11e3a39807eb5a200445ae9082843ab86800415","versionType":"git"},{"version":"ec97ecf1ebe485a17cd8395a5f35e6b80b57665a","status":"affected","lessThan":"6655b56e2801008566c594ef231f6c7b3f716c61","versionType":"git"},{"version":"ec97ecf1ebe485a17cd8395a5f35e6b80b57665a","status":"affected","lessThan":"4864f58c53eb47257d55e01f47d4a9f355f7f970","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/sched/sch_fq_pie.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.6","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.6","versionType":"semver"},{"version":"5.10.271","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.222","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.189","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.158","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.111","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.53","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.7","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/sched/sch_fq_pie.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/ff4f3a0f3abd2ded467931d7da7984a68a768e0b"},{"url":"https://git.kernel.org/stable/c/749aaebc1eb92ce2f38fd3caf68a2f99686d84ef"},{"url":"https://git.kernel.org/stable/c/8fd98e56c41f79278eeb67512c28d7abc175bcf4"},{"url":"https://git.kernel.org/stable/c/215df1e953ae72a09d425ec188e054058ae23dc9"},{"url":"https://git.kernel.org/stable/c/f90fe65b977e7aa9eb302230a09eb18f8c32ceaa"},{"url":"https://git.kernel.org/stable/c/c11e3a39807eb5a200445ae9082843ab86800415"},{"url":"https://git.kernel.org/stable/c/6655b56e2801008566c594ef231f6c7b3f716c61"},{"url":"https://git.kernel.org/stable/c/4864f58c53eb47257d55e01f47d4a9f355f7f970"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-19T09:12:18.653Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.6","versionEndExcluding":"5.10.271"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.6","versionEndExcluding":"5.15.222"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.6","versionEndExcluding":"6.1.189"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.6","versionEndExcluding":"6.6.158"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.6","versionEndExcluding":"6.12.111"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.6","versionEndExcluding":"6.18.53"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.6","versionEndExcluding":"7.2.7"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.6","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}